Settings API options page

<?php
/**
 * Settings page: Settings -> Acme.
 *
 * @package Acme_Core
 */

defined( 'ABSPATH' ) || exit;

add_action( 'admin_menu', static function (): void {
	add_options_page( __( 'Acme settings', 'acme-core' ), __( 'Acme', 'acme-core' ), 'manage_options', 'acme-settings', 'acme_settings_render' );
} );

add_action( 'admin_init', static function (): void {
	register_setting( 'acme_settings_group', 'acme_options', array(
		'type'              => 'array',
		'sanitize_callback' => 'acme_sanitize_options',
		'default'           => array( 'api_url' => '', 'per_page' => 10, 'enabled' => 0 ),
	) );

	add_settings_section( 'acme_main', __( 'General', 'acme-core' ), '__return_false', 'acme-settings' );

	$fields = array(
		'api_url'  => array( __( 'API URL', 'acme-core' ), 'url' ),
		'per_page' => array( __( 'Items per page', 'acme-core' ), 'number' ),
		'enabled'  => array( __( 'Enable feature', 'acme-core' ), 'checkbox' ),
	);
	foreach ( $fields as $key => [ $label, $type ] ) {
		add_settings_field( $key, $label, 'acme_field_render', 'acme-settings', 'acme_main', array( 'key' => $key, 'type' => $type, 'label_for' => 'acme_' . $key ) );
	}
} );

function acme_sanitize_options( $input ): array {
	$input = is_array( $input ) ? $input : array();
	return array(
		'api_url'  => esc_url_raw( $input['api_url'] ?? '' ),
		'per_page' => min( 100, max( 1, absint( $input['per_page'] ?? 10 ) ) ),
		'enabled'  => empty( $input['enabled'] ) ? 0 : 1,
	);
}

function acme_field_render( array $args ): void {
	$opts  = get_option( 'acme_options', array() );
	$key   = $args['key'];
	$value = $opts[ $key ] ?? '';
	$name  = 'acme_options[' . $key . ']';

	if ( 'checkbox' === $args['type'] ) {
		printf( '<input type="checkbox" id="acme_%1$s" name="%2$s" value="1" %3$s>', esc_attr( $key ), esc_attr( $name ), checked( 1, (int) $value, false ) );
		return;
	}
	printf( '<input type="%1$s" id="acme_%2$s" name="%3$s" value="%4$s" class="regular-text">', esc_attr( $args['type'] ), esc_attr( $key ), esc_attr( $name ), esc_attr( (string) $value ) );
}

function acme_settings_render(): void {
	if ( ! current_user_can( 'manage_options' ) ) {
		return;
	}
	echo '<div class="wrap"><h1>' . esc_html( get_admin_page_title() ) . '</h1><form method="post" action="options.php">';
	settings_fields( 'acme_settings_group' );
	do_settings_sections( 'acme-settings' );
	submit_button();
	echo '</form></div>';
}